stop valve



' 2 Sheets-Sheet 1'. J. PPAU.

. STOP VALVE.

(No Model No. 326,238. Patented Sept. 15,1885

JuL/Us u, 6, WM ML.

/WN W Witnesses N. PETERS Ehnwmno n hun Wilhinginn, D. c,

(No Model.) 2 Sheets-Shee.t 2.

' J. PPAU.

STOP VALVE.

No. 326,238. P ted Sept; 15, 1885.

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Wlnesses: Inwfiton I JUL/U8 PFAU,

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' Umrno STATE PATENT Farce.

JULIUS PFAU, or LANsINeBUne, nssionoe or ONE-HALF cro JAMES w. LEssIne, or ALBANY, new YORK.

STOP-VALVE.

srncrrroarron forming part of Letters Patent No. 38, dated September 15, 1885,

Application filed February 12, 1885. (No model.)

To all whom it may concern.-

Be it known that I, J ULIUs PFAU, of Lan singburg, in the county of Rensselaer'and State of New York, have invented new and useful Improvements in Stop-Valves, of which the following is a specification.

My invention relates to improvements in gate stop-valves, in which are combined a straight water-way, a central valve-chamber having oppositely-located valve-seats, sliding gates arranged to move at right angles to the line of the water-way, and gate-spreading mechanism adapted to spread apart the sliding gates and press them tightly against the valve-seats, so as to effectually close the water-way against the passage of fluids therethrough.

One of the best-known defects in the class of stop-valves above referred to is thetendency of their gate-spreading mechanisms to prematurely spread apart the gates, to bear against the opposite valve-seats, before the said gates are moved sufficiently far to entirely cover over the openings through the valveseats, thereby leaving the water-way partially open after the gate-spreading mechanism has completed its function. This premature action of the gate-spreading mechanism may be produced by any cause that will create sufficient friction between the faces of the gates and valve-seats to stay the closing movement of the gates sufficiently to bring the gatespreading mechanism into operation.

The object of my invention is to remedy the above-described defect, and I attain this obj ect by means of the mechanism illustrated in the accompanying drawings, which, being herein referred to, form part of this specification, and in which- I Figure 1 is a longitudinal section of the valve-casing, showing the internal parts in elevation, with the'valve ina closed condition, and one of the tilting dogs removed to expose underlying parts; Fig. 2, a like section showing the valve open. Figs. 3 and4 are respectively transverse vertical sections of Figs. 1 and 2 Fig. 5, a horizontal section at the line was of Fig. 4; Fig. 6, an end elevation of one of the tilting-dogs; Fig. 7 a rear elevation of a modified form of sliding gate, and Fig. 8 the Same with the tilting dogs attached.

As represented in the drawings, A indicates the valve-casing, which consists of the central valveohamber, a, oppositely-arranged valveseats a, having openings a and nozzles a, which latter, with the openings a constitute the straight water-way of the device. The valve-chamber a isprovided'with oppositelyarranged vertical ribs a, each of which has at its lower end a short horizontal rib, o whose face is flush with that of its conjoining vertical rib.

The bonnet B forms a cap for the valvechamber a, and is bored to receive the valvestem G. The said valve-stem is provided with a screw-threaded portion, 0, and with a collar, 0', by which said stem is held in the bonnet B from acquiring an endwise movement. The valve-stem 0 passes out of the bonnet B, (through a stuffing-box, 2),) and is provided with a hand-wheel, 0 or other suitable appliance for rotating it.

The stirrup or lifter D is tapped to form a nut for the screwed portion 0 of the valvestem, and the lower part of it (which is bifurcated to permit the lower end of the valvestem to pass through) is formed into wedgeshaped terminals d, havingat their upper ends shoulders d. Pintles d project laterally from the opposite edges of the stirrup D for the purpose of carrying the tilting dogs E, which are fitted to receive a vibratile movement on said pintles. The said dogs have their bodies bent at an obtuse angle, as shown in Figs. 3, 4, and S, and are provided at the bend of the angle with holese, which fit loosely on the pintles d", and at their lower end with hooks e, which are adapted to engage under the lower end of the stirrup D. A groove, 61, is formed in the outer side of the upper part of each dog, and the bottom face IOC the lower end of the ribs a. Vhen the'stirrup D is forced down to-very nearly the lower extremity of its movement, the inclined upper part of the dogs E will be brought into contact with the horizontal ribs a, and thereby said dogs will "be tilted so that their books 0 will be moved out from under the lower end of the stirrup D into the position shown in Fig. 3.

The sliding gates F are preferably made in the form of disks, with spurs f projecting from their lower edges. Said spurs are adapted to strike against the lower part of the valve-casing, so as to prevent the sliding gates from being moved down far enough to uncover the upper part of the openings a". The outer faces of the sliding gates F are fitted to form water-tight joints with the valve-seats a, and their opposite faces are provided. with inclined planes f, stops f and snugs f. The inclined planes f are fitted to bear against the wedges d of the stirrup in such manner that said wedges will, when occasion requires, press apart the sliding gates and bring the faces of the latter into close contact with the valveseats a. The stopsf engage with the shoulders d ot the stirrup to effect the drawing up.t-he sliding gates for the purpose of uncovering the'water-way, and the snugs f are adapted to engage wit-h the under side of the hooks 6 when the latter are in the position shown in Fig. 4, thereby locking the shoulders (1 against the stops f, and preventing the wedges d from acting against the inclined planes f to produce a premature pressing apart of the sliding gates F before they reach the proper point in their movement to have that action occur.

\Vhen the gates are in the raised position shown in Figs. 2 and 4,they will be held quite free from the faces of the valve-seats a, and said gates will then be sustained by their stops f", which rest on the shoulders d of the stirrup, and the dogs E will have their hooks e thrown inwardly between the lower end of the stirrup D and the snugs f This position of the hooks 0 will be maintained during the downward movement of the gates F until the latter have very nea'rlyreached the lowest point of their movement, and thereby the faces of the gates will be kept entirely clear from the faces of the val ve-seats, and so that the gates can be moved with perfect freedom either up or down. A moment before the gates F reach the extremity of the downward movement the inclined upper part of the dogs E will strike the ribs a and cause the said dogs to tilt on the pintles d and retract the hooks e from beneath the stirrup D. By the slight continued downward movement of the stirmp its wedges (I will act against the inclined planes f of the gates and cause the two gates to be pressed apart into close contact with the valves-seats a, and thereby effectually closing the water-way of the device. ward movement of the stirrup D will cause the lower part of the dogs E to strike the ribs (i thereby tilting said dogs back into their first position with their hooks e engaged under the lower end of the stirrup D, as shown in Fig. 4.

In Figs. 7 and 8 a modified form of the gates F and dogs E is shown. In this modification the gates F are provided with two pins, f, on tleir backs, in addition to the inclined faces f, stops f, and snugs f hcreinbefore described. Thedogs E have the hooks e and groove 0 hereinbefore described, and are provided on their opposite edges with holes The first upe, which fit upon the pins f, so as to permit the said dogs to tiltin the manner above described.

When the gates and dogs are constructed in accordance with the above modification,the pintles (1 will be omitted from the stirrup D,

and the snugs f may, when preferred, be omitted from the backs of the sliding gates F; but the operation of theseveral parts willbe the same as hereinbefore described.

A I claim as my invention-- l. The combination, with a valve'casing, A, having a valve-chamber, a, provided with the vertical ribs-a and horizontal ribs a as described, of the stirrup D, provided with wedges d, the sliding gates F, having inclined planes'f and snugsf and the tilting dogs E, provided with hooks e, adapted to engage between the lower end of the stirrup D and the snugs f, in the manner and for the purpose herein specified.

2. The combination, with valve-casing A, having a valve chamber, a, provided with vertical ribs a and horizontal ribs a, as described, of the stirrup D, sliding gates F, and tilting dogs E, the said dogs being provided with hooks e, which are adapted to engage under the lower end of the stirrup D, as herein set forth, all of said parts being constructed and arranged to operate as and for the purpose specified. JULIUS PFAU.

Witnesses:

WM. H. Low, S. B. BREWER.

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It is hereb$ certified that the name of the assignee in Letter ranted September 15,1885, upon the application of Julius Pfau,

should have been Written and printed James H. Blessing ins and that the said Letters Patent should be read with this 

